JP3543827B2 - Antenna device - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to an antenna device for receiving radio waves arriving from a satellite such as a broadcast satellite or a communication satellite, and more particularly to an antenna device capable of receiving radio waves arriving from a plurality of satellites with individual primary radiators. .
[0002]
[Prior art]
When receiving radio waves arriving from a plurality of satellites, a separate parabolic antenna is used for each satellite. The parabolic antenna has a primary radiator at the focal position of the reflector. Moreover, it is common to extend the arm forward from the lowermost end of the reflector so as not to block radio waves arriving at the reflector, and to support the primary radiator.
[0003]
[Problems to be solved by the invention]
By the way, when the above-mentioned parabolic antenna is used, a number of parabolic antennas corresponding to the number of satellites to be received must be installed, and a large space is required for the installation of the parabolic antenna, or each antenna is required. Had to be adjusted to orient it towards the satellite, and the work was very time-consuming. Therefore, it has been considered that two primary radiators are arranged side by side at the tip of the arm to receive the two radio waves individually. Such an arrangement is also filed by the present applicant in Japanese Patent Application No. 4-146593. When such an antenna device is used, radio waves arriving from a plurality of satellites can be respectively received by the antenna device using only one reflector, and the installation space is small, and the antenna is connected to the satellite. The adjustment work in the direction of can be performed very easily.
[0004]
[Problems to be solved by the invention]
However, when trying to receive each radio wave from two communication satellites, for example, Super Bird B and JCSAT2, using the above configuration, for example, in the Kyushu area, as shown in FIG. The support arm 6f supposed to be provided at the lowermost end is lifted to the upper left, and the positions of the two primary radiators 7f and 8f are similarly raised to the upper left. However, if the antenna is installed in such a state, if a third party who is familiar with the installation state of the normal satellite broadcast receiving antenna sees it, it may be installed in the wrong direction in the wrong direction. There was a problem that it felt that it was being carried out and was extremely reputed, preventing its practical use.
[0005]
The present invention has been made in order to solve the above-mentioned problems (technical problems) of the prior art, and it is possible to receive radio waves respectively arriving from a plurality of satellites with an antenna device using only one reflector. In addition, the installation space is small and the adjustment work for pointing the antenna toward the satellite can be performed very easily. In addition, in the three major cities, which are the main markets in Japan, ordinary satellite An object of the present invention is to provide an antenna device capable of properly receiving radio waves from the two communication satellites in an installation state in which a person familiar with the installation state of the broadcast receiving antenna does not feel a sense of discomfort at all. I have.
[0006]
[Means for Solving the Problems]
Antenna apparatus in the present invention, and one reflector for reflecting the radio waves coming from a plurality of satellites, the primary radiator for support that is extended toward the lower position of the reflecting mirror to the front of the reflector Arm, a plurality of primary radiators mounted on the free end of the arm so as to individually receive the plurality of incoming radio waves reflected by the reflector, and a support device that supports the reflector In the antenna device provided,
The support device includes a first coupler freely adjustable azimuth midpoint oriented line connecting the midpoint of the aperture center and the plurality of satellites in the reflector,
A second coupler that is capable of adjusting the elevation angle of the midpoint directing line in the reflector and that has a scale indicating the elevation angle;
A third coupler that allows rotation of the reflector about the midpoint directional line in the reflector and that has a scale indicating the rotational position;
The plurality of primary radiators positional relation each other, in the center region of the Japanese islands in a state where the arm has placed the antenna device to come to substantially right below the position of the reflecting mirror, the plurality of primary radiator of the plurality to respectively corresponding positions to the respective focusing positions of the radio waves coming from the satellite, each other and a positional relationship shifted position vertically, moreover, the direction of the receiving plane of polarization of one of the primary radiator, the reflecting mirror major axis of the The direction of the reception polarization plane of the other primary radiator is set to be inclined by 7.37 ° from the direction of the minor axis of the reflector. Amendment of procedure to replace written opinion [0007]
[Action]
When trying to receive radio waves arriving from a plurality of satellites respectively, the reflecting mirror is turned around the midpoint directing line by the third coupler, and the rotational position scale is adjusted to a predetermined point. Further, the elevation angle of the reflector is adjusted so that the elevation scale has a predetermined value. Thereafter, the reflector is turned horizontally in the first coupler so that the radio wave can be received at the maximum level in any of the primary radiators. The adjustment is completed by these operations.
[0008]
【Example】
Hereinafter, drawings showing an embodiment of the present application will be described. In FIG. 1, reference numeral 1 denotes an antenna device. Reference numeral 2 denotes a mast in the antenna device, which is installed in a vertical state, and whose lower end is fixed to a fixed object such as a foundation. Reference numeral 3 denotes a supporting device mounted on the top of the mast 2, and reference numeral 4 denotes a parabolic antenna supported by the supporting device 3, which is an offset parabolic antenna as an example. Reference numeral 5 denotes a reflector in the antenna 4, and reference numeral 6 denotes an arm for supporting a primary radiator, which is provided so as to extend from one end of the long axis of the reflector 5 to the front of the reflector 5. Reference numerals 7 and 8 denote primary radiators for receiving radio waves arriving from different satellites, each of which has a built-in converter. 9 is an output terminal of each primary radiator.
[0009]
The primary radiators 7 and 8 will be described. The primary radiator 7 is for receiving radio waves arriving from Superbird B as an example of a satellite, and the primary radiator 8 is for receiving radio waves arriving from JCSAT2 as an example of another satellite. These primary radiators 7, 8 are arranged in Nagoya as an example of the central region of the Japanese archipelago in a state where the antenna device is installed so that the arm 6 is located directly below the reflector 5. Is symmetrical with respect to the focal point F of the reflecting mirror 5 as shown in FIG. Are located in In FIG. 5, the angle α between the direction 12 connecting the primary radiators 7 and 8 and the direction 5b of the minor axis of the reflecting mirror 5 is set to, for example, 23 °. The interval between the two primary radiators 7 and 8 corresponds to the interval between two satellites to be received. Reference numeral 7a denotes the direction of the reception polarization plane of the primary radiator 7, which is coincident with the direction 5a of the long axis of the reflector 5. Reference numeral 8a denotes the direction of the reception polarization plane of the primary radiator 8, which is inclined by 7.37 ° from the direction 5b of the minor axis of the reflecting mirror 5. The primary radiator uses a number corresponding to the number of satellites that want to receive the transmitted radio wave. If the number is odd, one is placed at the position of the focal point F, and the other is set as described above. They are placed at predetermined intervals so as to be arranged in the direction of the angle α. In the case of an even number, they are arranged at predetermined intervals so as to be arranged in the direction of the angle α about the focal point F. Note that Nagoya was defined as the central area because if the short axis of the reflector 5 in the antenna is 120 cm, the radio waves from the two satellites can be received from Hokkaido to Kyushu. Is almost Nagoya. The central area may be defined as a central area in a region where the antenna device is actually used. For example, when the antenna device is used only in Tohoku and Hokkaido, the antenna device may be set in the central region of those regions. Alternatively, it may be set in the central area of the market for the antenna device.
[0010]
Referring again to FIG. 1, reference numeral 10 denotes the center of the opening of the reflecting mirror 5 (r = r '). Reference numeral 11 denotes an intermediate point directing line in the reflector 5, which connects the aperture center 10 and an intermediate position of the plurality of satellites when radio waves arriving from a plurality of satellites are individually received by corresponding primary radiators. Line. The intermediate point directing line 11 is parallel to the optical axis (the central axis of the paraboloid of revolution) of the reflecting mirror 5 in this example. The intermediate position of a plurality of satellites is the intermediate position of the middle two satellites when the number of satellites is even, and is the position of the satellite located exactly in the middle when the number of satellites is odd.
[0011]
Next, the support device 3 will be described. Reference numeral 15 denotes a first coupler for adjusting the azimuth of the intermediate point directing line 11 in the reflecting mirror 5. Reference numeral 16 denotes a second coupler for adjusting the elevation angle of the intermediate point directing line 11. Reference numeral 17 denotes a third coupler for rotating the reflecting mirror 5 about the intermediate point directing line 11.
[0012]
The first coupler 15 will be described. Reference numeral 21 denotes a base adapted to be along the mast 2, reference numeral 22 denotes a fastening piece opposed to the base 21 with the mast 2 interposed therebetween, and reference numeral 23 denotes a screw rod for tightening. These can fix the base 21 to the mast 2 by tightening the screw rod 23, and can rotate the base 21 around the mast 2 in the horizontal direction by loosening. Reference numeral 24 denotes a stopper attached to the base 21 for engaging the upper end of the mast 2 to prevent the fitting 15 from dropping.
[0013]
Next, the second coupler 16 will be described. This coupling uses the base 21 in common. Reference numeral 26 denotes a tilting body, which can tilt up and down with respect to a base 21 around a pivotal attachment 27 (for example, a screw rod). Reference numeral 28 denotes a fixture, for example, a bolt, which is screwed to the base 21 through an elongated hole 29 formed in the tilting body 26. By loosening the fixture 28, the tilting body 26 can be freely tilted, and by tightening, the tilting body 26 is fixed to the base 21. Reference numeral 30 denotes a scale attached to the tilting body 26 for displaying the elevation angle of the intermediate point directing line 11. The fixing device 28 also serves as an index for indicating the scale 30.
[0014]
Next, the third coupler 17 will be described with reference to FIGS. Reference numeral 32 denotes a shaft, which is a cylinder. Reference numeral 33 denotes a reflecting mirror mounting member attached to one end of the shaft body, and the reflecting mirror 5 is mounted on the mounting member 33. The relationship between the shaft body 32 and the reflecting mirror 5 is such that the central axis of the shaft body 32 coincides with the midpoint directing line 11 of the reflecting mirror 5. Reference numeral 34 denotes a support for supporting the shaft 32, which is fixed to the tilting body 26. Reference numeral 35 denotes a receiving portion of the receiving member, which is formed in a semicircular arc shape corresponding to the shape of the shaft body 32. Reference numeral 36 denotes a stopper attached to the receiving member 34 for preventing the shaft 32 from sliding down. Reference numeral 37 denotes a presser provided so as to face the receiving member 34 with the shaft 32 interposed therebetween. Reference numeral 38 denotes a presser portion of the presser 37, which is formed in a semicircular arc shape corresponding to the shape of the shaft 32. Reference numeral 39 denotes a screw thread for tightening, which penetrates the presser 37 and is screwed to a nut 40 fixed to the receiver 34.
[0015]
In the third coupler 17 having the above structure, by loosening the tightening screw rod 39, the shaft body 32 becomes rotatable, and the reflecting mirror 5 can be rotated about the intermediate point directing line 11, By tightening the screw rod 39, the holding member 37 and the receiving member 34 can be fixed so that the shaft 32 is not rotatable with the shaft 32 interposed therebetween. In FIG. 4, reference numeral 41 denotes an index provided on the shaft 32, reference numeral 42 denotes a scale provided on the presser 37, which indicates the rotational position of the reflecting mirror 5, and in this example, in each region in Japan. The position where the above index 41 should be set is marked. An angle scale may be used.
[0016]
Next, the installation of the antenna device will be described. First, the mast 2 is set up at a predetermined installation location, and the support device 3 is attached to it. Thereafter, the antenna 4 assembled in advance is attached to the supporting device 3.
[0017]
Next, adjustment of the direction of the installed antenna will be described. First, the third coupler 17 is loosened, and the reflecting mirror 5 is rotated about the shaft 32 so that the index 41 indicates a scale 42 which is predetermined for the installation area of the antenna. Then, the third coupler 17 is fixed at that position. By this adjustment, when the antenna device 1 is viewed along the intermediate point directing line 11, a state shown in FIG. 6 is obtained. Next, the second coupler 16 is loosened, and the reflecting mirror 5 is swung up or down around the pivotal attachment 27 so that the indicator 28 points to a scale 30 of a predetermined value for the installation area of the antenna. To Then, the second coupler 16 is fixed at that position. Next, for example, a level meter is connected to the output terminal 9 of any of the primary radiators. Then, the first coupler 15 is loosened, and the reflecting mirror 5 is turned in the horizontal direction around the mast 2 so that the indicated value of the level meter becomes maximum. Then, the first coupler 15 is fixed in this state. This completes the adjustment work. In this completed state, the intermediate point directing line 11 is correctly directed to the intermediate points of a plurality of satellites, and the radio wave from the super bird B is reflected by the reflecting mirror 5 so as to be properly focused on the primary radiator 7 and the primary radiator 7 is focused. The radio wave received by the radiator 7 and the radio wave from the JCSAT 2 are reflected by the reflecting mirror 5, are properly focused at the primary radiator 8, and are received by the primary radiator 8.
[0018]
Next, FIG. 7 shows a state in which the satellite Super Bird B (indicated by reference numeral 45) and the satellite JCSAT2 (indicated by reference numeral 46) are seen in Sapporo, FIG. 8 shows a state in which both satellites are seen in Nagoya, and FIG. Shows a state where both satellites are seen at Tanegashima. In these figures, 51 is the geosynchronous orbit plane of both satellites, 52 is the vertical line in each area, 53 is the direction of the normal to the geosynchronous orbit plane at each satellite position, and 45a and 46a are the launches from each satellite. The directions of the polarization planes of the radio waves to be transmitted are shown. In the antenna device having the above-described configuration, the intermediate point directing line 11 is correctly directed to the middle between the two satellites 45 and 46 by the adjustment operation as described above, and the directions 7a, 7a, 8a coincides with the directions 45a and 46a of the polarization planes of the satellites 45 and 46, respectively.
[0019]
【The invention's effect】
As described above, according to the present invention, even when the radio waves arriving from the plurality of satellites 45 and 46 are individually received by the plurality of primary radiators 7 and 8 corresponding to the respective radio waves, the plurality of radio waves are simply Of course, it has a configurational effect of allowing the light to be received by the individual primary radiators 7 and 8 after being reflected by the two reflecting mirrors 5, respectively.
In the case where the antenna device is installed and the reception is performed as described above, the reflector 5 is rotated to adjust the scale 42 of the rotational position, and the reflector 5 is swung up or down. When the elevation scale 30 is adjusted, the reflector is turned in the horizontal direction with a measurement meter connected to one of the primary radiators 7 so that the meter indicates the maximum reception level. By making three adjustments (adjusting the azimuth angle ), the radio waves from any satellite can be properly received, respectively, and even a worker with little knowledge of radio waves can make adjustment work extremely easily and quickly. effective.
[0020]
Moreover, the positional relationship between the plurality of primary radiators 7 and 8 is such that the primary radiators 7 and 8 are located in a central region of the Japanese archipelago in a state where the arm 6 is located substantially below the reflecting mirror 5. Since the positions are shifted up and down so as to correspond to the respective convergence positions of the arriving radio waves from a plurality of satellites, for example, as shown in FIG. In addition to the arm 6 and the primary radiators 7, 8 coming directly below the reflecting mirror 5, the arm 6 and the primary radiators 7, 8 come to just below the reflecting mirror 5 in Tokyo and Osaka. Even in Kyushu or Hokkaido, as shown in FIGS. 10A and 10C, they come to a position that does not greatly deviate from directly below, and can be seen without any discomfort even for a person who is accustomed to a normal satellite broadcast receiving antenna. There is a feature that becomes a stationary state.
[Brief description of the drawings]
FIG. 1 is a side view of an antenna device.
FIG. 2 is a longitudinal sectional view of a third coupler.
FIG. 3 is a sectional view taken along line III-III in FIG. 2;
FIG. 4 is a view (partially cutaway view) in the direction of arrow IV in FIG. 1;
FIG. 5 is a view of the primary radiator in the direction of the arrow V in FIG. 1;
FIG. 6 is a view in the direction of the arrow VI in FIG. 1;
FIG. 7 is a diagram showing a state in which two satellites are viewed in Sapporo.
FIG. 8 is a diagram showing a state in which two satellites are viewed in Nagoya.
FIG. 9 is a diagram showing a state where two satellites are viewed at Tanegashima.
10A is a front view showing an installation state of an antenna device in Kyushu, FIG. 10B is a front view showing an installation state of an antenna device in Nagoya, and FIG.
FIG. 11 is a front view showing an installation state of a conventional antenna device in Kyushu.
[Explanation of symbols]
3 Supporting device 5 Reflector 7,8 Primary radiator
11 Midpoint directional line
15 First fitting
16 Second fastener
17 Third fastener

Claims (1)

And one reflector for reflecting the radio waves coming from a plurality of satellites, the arm from the lower position of the primary radiator supporting that is extended toward the front of the reflector of said reflecting mirror, the reflecting mirror A plurality of primary radiators mounted on the free end of the arm so that each of the plurality of arriving radio waves reflected by the antenna can be individually received, and an antenna device including a supporting device that supports the reflecting mirror,
The support device includes a first coupler freely adjustable azimuth midpoint oriented line connecting the midpoint of the aperture center and the plurality of satellites in the reflector,
A second coupler that is capable of adjusting the elevation angle of the midpoint directing line in the reflector and that has a scale indicating the elevation angle;
A third coupler that allows rotation of the reflector about the midpoint directional line in the reflector and that has a scale indicating the rotational position;
The plurality of primary radiators positional relation each other, in the center region of the Japanese islands in a state where the arm has placed the antenna device to come to substantially right below the position of the reflecting mirror, the plurality of primary radiator of the plurality to respectively corresponding positions to the respective focusing positions of the radio waves coming from the satellite, each other and a positional relationship shifted position vertically, moreover, the direction of the receiving plane of polarization of one of the primary radiator, the reflecting mirror major axis of the An antenna device, wherein the direction of the reception polarization plane of the other primary radiator is set to be 7.37 ° from the direction of the minor axis of the reflector.

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